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Functional Assessment of Passive Seismic Base Isolation Systems Considering the Effect of Seismic Risk

Bijari, Hossein | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52169 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Bakhshi, Ali
  7. Abstract:
  8. The main goal of this study is to calculate the probability of exceedance from each level of failure zone. Seismic base isolation systems are one of the effective method to reduce seismic response of structures. This system helps to improve structural behavior by reducing acceleration and relative displacement of story. On the other hand, the main problem is to increase the base displacement of building. To solve this, these systems are used with passive or semi-active control systems. This type of system has benefits of both passive ad semi-active control simultaneously. Base isolation is less effective in tall structures due to the flexural and shear behavior. In this study Haselton structural models (tow dimensional frames) were used with 2 different heights (8 and 13 story) in the opensees software. 4 types of base isolation were used considering LRB, FPS, LDR and HDR. Structural response obtains from Matlab software. 78 earthquake records were applied to structure and probability of exceedance from the main Hazus-MH failure criteria was calculated. For the 8 story frame, the LRB and FPS base isolation had a better reduction in probability of exceedance than the others. In the case of relative displacement, the LRB system has the least impact. For the other two criteria, max abs acceleration and shear strain at vase level, FPS system was slightly better. Among the Hazus failure criteria, ma shear strain played a more decisive role in seismic risk. It was also observed for 13-story frame that base isolation systems had less effect than 8-story structure on the reduction of the seismic response and similarly reduced the probability of exceedance
  9. Keywords:
  10. Base Isolation ; Seismic Risk Index ; Passive Control ; Seismic Response ; Performance Evaluation ; Vibration Isolators

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